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perbandingan p : l = 4x : 3x
K = 2(p+l)
84 = 2 (4x+3x) kedua sisi dibagi 2
42 = 7x
x = 42/7
x - 6
p = 4.6 = 24 cm
l = 3.6 = 18 cm
L = p.l = 24x18 = 432 cm²